I have been developing for a few months with the Hololens but now I have switched over to the ASUS MR headset - which is what I really needed. My question is how to connect up the Asus headset via the holographic emulator? What IP do I use? I am still using Unity 5.6.1F1.
Aside from double-checking that the Emulation Mode is set to None, you shouldn't need to use the Holographic Emulation window for playing in-editor with VR HMDs - that window is just meant for the HoloLens. If you have your Build Settings set up to target Windows Mixed Reality and have a matching headset plugged in, playing in-editor should just work. However, you need to use 2017.2, which is currently in beta - VR HMDs for Windows Mixed Reality have no support in Unity prior to that version.